linuxjdk配置环境变量

不需要删除旧的jdk，安装新版本的jdk，再更新环境变量即可。 Linux下安装jdk，步骤如下 1：下载jdk包：本章使用的为后缀为tar.gz的文件（不需要安装），如jdk-8u111-linux-x64.tar.gz 2：把jdk文件保存至Linux下目录：通过控制台，使用mkdir命令生成usr/java目录，并把文件放入其下 3：解压tar.gz文件：通过控制台，进...

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